Johnson smashed the 11 year old record of Australian Andrew Buckle by five shots in an event that dates back to 1941.
Three Australians played the event and it was Queenslander James Gibellini who did best when he closed with a final round of 68 to finish 10th, albeit 18 shots from the runaway winner.
Townsville's Jake McLeod finished 35th and Indooroopilly's Aaron Wilkin 43rd.
Want video tips delivered straight to your inbox? Subscribe to iseekgolf.com newsletters.